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    Lunar and Planetary Institute
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    In this activity, dry ice and other items are used to construct a demonstration model of a comet that illustrates the comet nucleus, coma, and tails. This activity introduces learners to the...

    $10 - $20 per group Ages 8 - 14 30 to 45 minutes
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    Astronomical Society of the Pacific
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    In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets. Learners will investigate the ingredients in comets and how...

    $5 - $10 per group Ages 6 - adult 10 to 30 minutes
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    Lunar and Planetary Institute
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    In this activity, learners investigate the Moon's infancy and model how an ocean of molten rock (magma) helped shape the Moon that we see today. Learners create a simple model of this process...

    Over $20 per group Ages 8 - 14 10 to 30 minutes